@article {49105,
	title = {The periodic motion of lodgepole pine trees as affected by collisions with neighbours},
	volume = {22},
	year = {2008},
	pages = {475-482},
	publisher = {Trees},
	url = {http://www.springerlink.com/content/c3550023q86h4x87/fulltext.pdf},
	author = {Rudnicki, Mark and Meyer, Thomas H. and Lieffers, Victor J. and Silins, Uldis and Webb, Vincent A.}
}
